Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual Social AO tem um CO Externo de simonas savickas e um CO Interno de pieter kuijsten?
 ###Tabelas: CREATE TABLE names_and_fleet_details (names_and_fleet_details_id AUTO_INCREMENT PRIMARY KEY, Original number VARCHAR, UIC number VARCHAR, Name VARCHAR, Constructer VARCHAR, constructor number INT, Year INT, Withdrawn VARCHAR, Kilometers worked INT) CREATE TABLE past_composition_of_the_executive_board (past_composition_of_the_executive_board_id AUTO_INCREMENT PRIMARY KEY, President VARCHAR, Treasurer VARCHAR, Secretary VARCHAR, Social AO VARCHAR, Academic AO VARCHAR, Internal CO VARCHAR, External CO VARCHAR) CREATE TABLE list_of_participants (list_of_participants_id AUTO_INCREMENT PRIMARY KEY, Elector VARCHAR, Place of birth VARCHAR, Cardinalatial title VARCHAR, Elevated VARCHAR, Elevator VARCHAR) CREATE TABLE novelisations (novelisations_id AUTO_INCREMENT PRIMARY KEY, Story # INT, Target # VARCHAR, Title VARCHAR, Author VARCHAR, Reader VARCHAR, Format VARCHAR, Company VARCHAR, Release Date VARCHAR, Notes VARCHAR) CREATE TABLE 1850_1871 (1850_1871_id AUTO_INCREMENT PRIMARY KEY, Class VARCHAR, Wheel arrangement VARCHAR, Manufacturer VARCHAR, Year made VARCHAR, Quantity made VARCHAR, Quantity preserved VARCHAR, Year(s) withdrawn VARCHAR)  
SELECT Social AO FROM past_composition_of_the_executive_board WHERE External CO = simonas savickas AND Internal CO = pieter kuijsten